STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and ...

RM0008
Secure digital input/output interface (SDIO)
Table 128.
Card status (continued)
Bits Identifier Type Value Description
Clear
condition
19 ERROR E X
’0’= no error
’1’= error
(Undefined by the standard) A generic
card error related to the (and detected
during) execution of the last host
command (e.g. read or write failures).
C
18 Reserved
17 Reserved
16 CID/CSD_OVERWRITE E X
’0’= no error ‘1’=
error
Can be either of the following errors:
– The CID register has already been
written and cannot be overwritten
– The read-only section of the CSD does
not match the card contents
– An attempt to reverse the copy (set as
original) or permanent WP
(unprotected) bits was made
C
15 WP_ERASE_SKIP E X
’0’= not protected
’1’= protected
Set when only partial address space
was erased due to existing write
C
14 CARD_ECC_DISABLED S X
’0’= enabled
’1’= disabled
The command has been executed without
using the internal ECC.
A
13 ERASE_RESET
’0’= cleared
’1’= set
An erase sequence was cleared before
executing because an out of erase
sequence command was received
(commands other than CMD35, CMD36,
CMD38 or CMD13)
C
12:9 CURRENT_STATE S R
0 = Idle
1 = Ready
2 = Ident
3 = Stby
4 = Tran
5 = Data
6 = Rcv
7 = Prg
8 = Dis
9 = Btst
10-15 = reserved
The state of the card when receiving the
command. If the command execution
causes a state change, it will be visible to
the host in the response on the next
command. The four bits are interpreted as
a binary number between 0 and 15.
B
8 READY_FOR_DATA S R
’0’= not ready ‘1’
= ready
Corresponds to buffer empty signalling on
the bus
7 SWITCH_ERROR E X
’0’= no error
’1’= switch error
If set, the card did not switch to the
expected mode as requested by the
SWITCH command
B
6 Reserved
5 APP_CMD S R
‘0’ = Disabled
‘1’ = Enabled
The card will expect ACMD, or an
indication that the command has been
interpreted as ACMD
C
4 Reserved for SD I/O Card
Doc ID 13902 Rev 9 481/995